Tripresso

From semanticweb.org

Under the name tripresso a group of researchers discusses issues and tools for mapping RDf to the OO-world in Java.

[edit] Logo Ideas

[edit] Participants

Max Völkel (voelkel/at/fzi.de), Karlsruhe, tool: RDFReactor
Sven Schwarz (schwarz/at/dfki.uni-kl.de), Kaiserslautern, tool: RDF2Java
Henry Story (henry.story/at/bblfish.net) , Berlin, tool: Sommer
Peter Mika FOAF, James Leigh, tool: Elmo
Sherman Monroe (sdmonroe/at/gmail.com) contributor

[edit] Process

We want to explore how or if we can combine our efforts to create fewer, better tools for mapping RDF to OO and back again.

Peter: My fear is that each triple store has a number of extra features and in some cases not using these features would hurt functionality or performance. (That said I dont' know RDF2Go and what it does in this respect.)

Max: It seems, we might need to agree on something like RDF2Go in order to overcome the triple store dependency. The currently proposed API can be inspected here.

Some tools generate Java code/interfaces from ontologies

we could agree on some annotations here

Some tools generate ontologies from Java

we could agree on some annotations here

Some tools use annotated Java with RDF

we could agree on some annotations here
James: Elmo and Sommer use very similar @rdf annotation, but Elmo annotates methods on Java interfaces and Sommer annotates fields on Java classes.

[edit] What do we offer?

[edit] RDF2Java

good command line
generates code from RDFS

[edit] Sommer

runtime via byte code rewriting
no generation of code
uses Java annotations
store: Sesame
vocabulary: any URIs

[edit] Elmo

BSD, Java 5.0, store Sesame (generic API);
Additional functionality on top of the triple store: predictive caching (preloading properties and saving query results for future queries), query expansion (for handling owl:sameAs), dealing with metadata (reification) ;
JavaBeans concepts for a number of well known web ontologies including Dublin Core, RSS and FOAF;
Dynamic Runtime JavaBean creation based on RDFS/OWL;
A set of tools related to the supported ontologies, including an RDF crawler, a generic smusher framework and a generic validator framework, with various smushers and a validator specific to FOAF;
Code generation using Groovy script template;
Elmo uses annotated Java interfaces, which are implemented by dynamic classes at runtime using Javassist.